Hamilton, Ala., in the fog on Thursday December 10, 2015.(Michael E. Palmer/Palmer's Almanac)

Today Marion County in Northwest Alabama was enveloped in a deep fog. Fog forms when water vapor condenses into tiny liquid water droplets suspended in the air. The National Weather Service issued a Dense Fog Advisory for much of the central United States- from Brownsville, Texas on the Mexican border all the way up to Cincinnati, Ohio. A dense fog advisory is issued when visability is reduced to a quarter-mile or less. Below are a few photos of the fog I made today in Hamilton, Guin, Gu-win and Winfield, Ala. Enjoy.